ProRes Codecs now a free download
Apple has released the ProRes Codecs as a free download for Mac QuickTime here:
http://support.apple.com/kb/DL1396
No word on a compressor for Windows, however.
UPDATE: These codecs still require an Apple Pro app installed to work. Cheapest option is still to get Compressor or Motion from the App Store for about $50. If the codecs are installed, Adobe apps can output ProRes.